Adobe Flex Authors: Matthew Lobas, PR.com Newswire, Shelly Palmer, Kevin Benedict

Related Topics: Adobe Flex

Adobe Flex: Article

Enterprise Flex: Debunking Urban Myths

Answering a long questionnaire on using Adobe Flex in enterprises

I got an email from an enterprise architect considering Adobe Flex as a platform for Web application development in their organization. This email contained a well prepared  list of questions/remarks/concerns that many of enterprise Web architects may face.  That’s why I decided to publish my short answers to these questions. I didn’t change the wording of the questions/ statements.


ActionScript3 is a weakly typed language

This is true, and when I started using it I was also getting angry with Flex compiler that wouldn’t catch my obvious mistake. But as you get more comfy in this environment, you’ll appreciate more and more the flexibility of this language. Most of the developers understand something like

var myCustomer: Customer=new Customer();

But look at the following notation:


The latter instruct the AS3 compiler, “Don’t bother checking if the Customer class even has a property lastName. I know for sure that it’ll be there during the runtime”. Does it look scary? Don’t use it!

Adding a keyword dynamic in the class definition allows you adding properties on the fly. Looks scary? Don’t use it.

To get a better feeling of pros and cons of using dynamic features of the language, read this blog on different styles of programming.

But applications written in dynamically typed languages do require more testing than those written in strongly-typed ones.

AS3 has no support for generics, method overloading, threading, enums, synchronization (handling of a resource e.g. file), annotations.

You need to use a different approach while evaluating domain specific languages vs. the common-purpose ones. Flex is a domain specific language that is not used for developing powerful scalable multi-threaded solutions on the server side. With Flex you are developing just the front end for the applications that are being used by a single user working on his/her computer.
The lack of generics is not a serious drawback (I can live without them in Java too).
Method overloading is not the feature of AS3, but it can be emulated using so called …rest parameter. This is not a showstopper.
From the developer’s perspective, Flex is single-threaded which minimizes the number of mistakes of unskilled (say Java Swing) developers who didn’t put code to refresh the screen into a proper thread, which causes unpredictable results.
Flex has so called metadata markup, which can play the role of annotations. Kinda.
Flex doesn’t support enums, but if this is important for you, consider using a solution offered by Farata Systems in this blog.

For security reasons, the reading/writing in files from Flex application is restricted. In some SharedObject’s may help, but if you need to have full file I/O support consider Adobe AIR.

Difficult to program to enterprise patterns: dominated by event model

While implementing design patterns you should account for specifics of the particular language/environment. Creators of one of the MVC frameworks shoot themselves in the foot by trying to avoid Flex specific event model by introducing more generic Notification class and by implementing Observer design pattern instead of using Flex-specific binding syntax. This approach resulted in creation of overly-engineered and convoluted framework that can be used in several languages, but doesn’t take advantage of goodies available in Flex. You can find some good examples of design patterns implementations in Chapter 2 of the book Enterprise Development with Flex currently available online.

Idiosynchratic binding restrictions and difficult two-way binding; may have been addressed with Flex v4?

The two-way binding is introduced in Flex 4. While being an excellent mean for increasing the productivity of Flex developers, don’t abuse binding. Nothing comes for free and just placing these elegant curly braces actually translates to a bunch of generated AS3 code and may lead to some performance issues in UI-intensive applications.

Poor Collection framework

Yes, AS3 collections are not as advanced as in Java, but they do a decent job if you take into consideration the small size Flash Player where they have to operate.

Generally immature API with numerous traps / pitfalls

ActionScript3 is more than a ten year old language and its current version is stable and doesn’t seem to have more bugs than other languages.

No support for XML schema validation

True. On the bright sight, Flex offers very easy syntax (E4X) for XML handling. But in general, I prefer minimizing using XML, if possible. Sending strongly-typed DTO’s from the server is a lot better way to architect applications.


Validation implementation too simple and not extensible

Consider using validation solutions from Clear Toolkit described over here. Validation solutions are extensible in Flex.

Poor error handling due to asynchronous event firing and separation of MXML and ActionScript in components

I wouldn’t use the word poor here.  When you work in asynchronous mode in any language, techniques for error handling are different. When an asynchronous callback is invoked in Flex as a result of the server side call it comes with an argument containing the error information similar to FaultEvent.

Limited printing support

True.  Consider using extended Flex components from Clear Toolkit that offer PDF generation on the client. Read more in Chapter 11 of the book Enterprise Development with Flex.

FlashPlayer 10 does not run on Windows 98 or Windows ME

So? Would you stick to Java 1.1 just because Internet Explorer doesn’t support any further versions of Java?  Stick to Flex 9 if supporting of older versions of Windows is a must.

Flash Player upgrade/compliance to potentially address bugs etc ... is an overhead and will depend on customer willingness to upgrade with any frequency. If a customer refuses to upgrade then what?

As of today, there is no other software in the world that can compare with Flash Player in terms of the speed of penetration. The upgrade is extremely easy.  The customer doesn’t want it…This is a problem in a democratic society. If this would happen in Soviet Union, KGB would simply send him/her to a labor camp in Siberia. This technique won’t work in the current enterprise environment though. Just ignore such customers. I know that some people turn off JavaScript support in their Web browsers, but this is not a good reason for not using JavaScript for Web development.


Poor / complex unit testing of component behavior

FlexUnit 4 adds a lot more flexibility for those who want it.

Absent integration testing between Flex client and middle tier

This is not true. The proper use of build scripts (Ant or Maven) in conjunction with such continuous integration tools as CruiseControl allows you to set up an environment that fits your needs.

Absent test automation

This is not true. Look at the open source FlexMonkey or commercial tools like QTP or Neoload

Lack of available testing tools
See above


Unimplemented build process automation

You might be tired by now by my suggestions to look at the Clear Toolkit, but it includes Fx2Ant tool that automatically generates Ant scripts for your Flash Builder projects.


Asynchronous platform difficult to code safely to resulting in unpredictable/inconsistent behavior

I see no grounds for such accusations. Asynchronous way of communication with the server side components is implemented in an easy to understand and consistent manner.

Complex event driven MVC model overlayed upon Flash's own event model
Internal Flex MVC model implemented in some components is typically built using binding and is not complex.

Mixing ActionScript and MXML -> complex, unstructured code (flabby code) - not dissimilar to coding JSPs with moderate to large amounts of JavaScript per file

MXML and AS3 code can be completely separated using various techniques. If you are into design patterns, read about the Code Behind over here.

No automated XML serialization support -> complex error prone data mapping and in some cases tests are the only mechanism to capture errors

I recommend minimizing use of XML in favor of strongly-typed data transferred using AMF or RTMP protocols.

No coding standards/guidelines developed to instruct developer's on how best to develop, what best practice is etc ...

Read about coding conventions here. A number of articles/books on best practices in Flex is already available in this number is growing

Follows same paradigm as HMTL/Javascript

I don’t agree. The main difference is that MXML gets automatically converted into AS3, which in turns gets compiled into bytecode. The byte code runs in the browser-independent VM. This is a huge advantage over developing in unpredictable HTML/JavaScript environments.

Code duplication:

Duplication of model across tiers

I wouldn’t call DTO’s that are traveling between the client and the server code duplication.

Duplication of validation rules across tiers

You shouldn’t program duplicate validation rules on the client and the server. Ideally, your Flex RIA should be developed as a stateful client, and you should apply validation logic accordingly without any duplication.

Technology boundary -> business logic tends to bleed into UI

I wouldn’t use the word bleed in this context. RIA with Flex is like a different incarnation of Client/Server technology. In the desktop world, Visual Basic or PowerBuilder also included a portion of business logic. Popularity of thin Web clients was rather a result of the stateless nature of HTTP protocols then business-driven solutions.

Third party support and documentation:

Incomplete IDE support: no refactoring, poor search functionality, missing many productivity features

Agree.  Flash Builder has room for improvements. IntelliJ IDEA may be considered an alternative IDE for some hard-core developers.

Few / immature third party library support

I know more than a dozen of third-party frameworks used by Flex developers.

Few written examples / templates - or too simple - of Flex in the enterprise

Agree, developers need more enterprise-level books and articles. Flex became a serious player on the enterprise market about three years ago and this explains relatively small number of non-trivial coding examples and case studies.  Flex is very easy to get started with, but unless you have an experienced technical leader on your project the chances are that you may create a poorly designed and slow performing application.

BlazeDS has some problems in relation to session management. We would need to rework the code or wait for a release to fix these problems

Consider re-thinking what data should be stored in a session. Ideally 90% of your session data should be stored on the client.

Client / user experience:

Slower startups due to fat client

You need to learn modularization techniques of Flex applications. Unless you are developing a Hello World type application, it has to have more than one SWF.

Requires Flash runtime @ set version with OS support

The ease of Flash Player upgrade makes this a non-issue


Much lower productivity compared to other frameworks; especially around XML transformation

I’d say that Flex is more productive environment than most others that I know about. I’d highly recommend avoiding using XML as a data format for client/server communications.

Much greater testing required due to asynchronous application behavior; testing is tricky as timing affects the results

True. Plan more time for testing of your enterprise Flex applications. On the other hand, you can extend and customize AMF and RTMP protocols (channels, endpoints, and adapters) and wrap them up into a separate layer to add more security, reliability or some business-specific functionality to create Web applications that are a lot more robust than HTML/JS ones.

Steep learning curve: significantly different programming paradigm to Java web development

I wouldn’t call it steep, but it’s not as easy as Adobe is trying to present. Get the right instructor or mentor.

Code scatter and poor organization leading to poor maintainability

Any event-driven programming environment may have code scattered in several entities but this doesn’t equate to poor maintainability. Based on my real-world experience in such environments (five years in PowerBuilder, two years in Visual Basic and three years in Flex) I can say that they do not require higher maintenance than Java enterprise projects, which I’ve been developing for 10+ years.

Poorer coding experience

The syntax of ActionScript looks very similar to Java and having declarative language for the UI part (MXML) is a trend in all modern RIA tools like Silverlight or JavaFX.

Proprietary technology

I used to hear this argument a lot back in 2006 when I had to convince AJAX proponents that it’s not the best choice for enterprise application. They used to say that AJAX has lots of open source frameworks and they didn’t want to lock themselves in with a proprietary technology from one vendor (Adobe). It didn’t occur to them that with Ajax, they’d definitely lock themselves in with one of the small vendors of the selected AJAX framework.
Flex SDK, BlazeDS and AMF protocol is an open source software  backed by a large vendor. If you don’t like something – get the code and modify it to as you see fit.

BlazeDS 4 has beta release; should we be investigating this version?

Abode has a history of drastically changing the API of the beta software. I wouldn’t advise to start any serious development with beta projects (the same applies to beta versions of Flash Builder 4 and LCDS 3.0). Keep an eye on the beta software but do not invest too much time in it unless you need some feature badly and are willing to keep modifying your application code with every new maintenance release.

Should we be using RemoteObject rather than XML and finding a workaround for the problem of passing nulls between Flex and Java?

Yes, you should be using RemoteObject not just to find a workaround for some problems, but to lower the network traffic, increase communication speed and work in a strongly typed environment.

Flex 4 has beta release; will this release address any of the issues raised above?

I hope that after reading my answers above you’d agree that the word issue is too strong here. Flex 4 will introduces a new set of components, Flash Builder will get new wizards (code generators) and Flash Catalyst that may improve the designer-developer workflow. But this version doesn’t introduce and revolutionary changes that would affect your decisions to use or not to use Flex platform for RIA. I personally try not to fall in love with any technology, and if I see a better RIA tool that can be used with enterprise applications, I’ll definitely consider it. As of today, I don’t see any serious competition to Flex in this space.

Those who are interested in learning/discussing Advanced features of Flex are invited to attend one of the technical seminars ran by Farata Systems. The closest ones are in London and Atlanta.

Disclaimer. I don’t work for Adobe and won’t be rewarded by them in any shape or form for promoting Flex.  I was never shy before and will not think twice discussing real issues in the design/implementation of Flex framework, but since this tool is better than others in the RIA  domain, it deserves appropriate credits.

More Stories By Yakov Fain

Yakov Fain is a Java Champion and a co-founder of the IT consultancy Farata Systems and the product company SuranceBay. He wrote a thousand blogs (http://yakovfain.com) and several books about software development. Yakov authored and co-authored such books as "Angular 2 Development with TypeScript", "Java 24-Hour Trainer", and "Enterprise Web Development". His Twitter tag is @yfain

Comments (0)

Share your thoughts on this story.

Add your comment
You must be signed in to add a comment. Sign-in | Register

In accordance with our Comment Policy, we encourage comments that are on topic, relevant and to-the-point. We will remove comments that include profanity, personal attacks, racial slurs, threats of violence, or other inappropriate material that violates our Terms and Conditions, and will block users who make repeated violations. We ask all readers to expect diversity of opinion and to treat one another with dignity and respect.

@ThingsExpo Stories
Cloud-enabled transformation has evolved from cost saving measure to business innovation strategy -- one that combines the cloud with cognitive capabilities to drive market disruption. Learn how you can achieve the insight and agility you need to gain a competitive advantage. Industry-acclaimed CTO and cloud expert, Shankar Kalyana presents. Only the most exceptional IBMers are appointed with the rare distinction of IBM Fellow, the highest technical honor in the company. Shankar has also receive...
Enterprises have taken advantage of IoT to achieve important revenue and cost advantages. What is less apparent is how incumbent enterprises operating at scale have, following success with IoT, built analytic, operations management and software development capabilities - ranging from autonomous vehicles to manageable robotics installations. They have embraced these capabilities as if they were Silicon Valley startups.
The standardization of container runtimes and images has sparked the creation of an almost overwhelming number of new open source projects that build on and otherwise work with these specifications. Of course, there's Kubernetes, which orchestrates and manages collections of containers. It was one of the first and best-known examples of projects that make containers truly useful for production use. However, more recently, the container ecosystem has truly exploded. A service mesh like Istio addr...
Predicting the future has never been more challenging - not because of the lack of data but because of the flood of ungoverned and risk laden information. Microsoft states that 2.5 exabytes of data are created every day. Expectations and reliance on data are being pushed to the limits, as demands around hybrid options continue to grow.
Poor data quality and analytics drive down business value. In fact, Gartner estimated that the average financial impact of poor data quality on organizations is $9.7 million per year. But bad data is much more than a cost center. By eroding trust in information, analytics and the business decisions based on these, it is a serious impediment to digital transformation.
Business professionals no longer wonder if they'll migrate to the cloud; it's now a matter of when. The cloud environment has proved to be a major force in transitioning to an agile business model that enables quick decisions and fast implementation that solidify customer relationships. And when the cloud is combined with the power of cognitive computing, it drives innovation and transformation that achieves astounding competitive advantage.
Digital Transformation: Preparing Cloud & IoT Security for the Age of Artificial Intelligence. As automation and artificial intelligence (AI) power solution development and delivery, many businesses need to build backend cloud capabilities. Well-poised organizations, marketing smart devices with AI and BlockChain capabilities prepare to refine compliance and regulatory capabilities in 2018. Volumes of health, financial, technical and privacy data, along with tightening compliance requirements by...
As IoT continues to increase momentum, so does the associated risk. Secure Device Lifecycle Management (DLM) is ranked as one of the most important technology areas of IoT. Driving this trend is the realization that secure support for IoT devices provides companies the ability to deliver high-quality, reliable, secure offerings faster, create new revenue streams, and reduce support costs, all while building a competitive advantage in their markets. In this session, we will use customer use cases...
Andrew Keys is Co-Founder of ConsenSys Enterprise. He comes to ConsenSys Enterprise with capital markets, technology and entrepreneurial experience. Previously, he worked for UBS investment bank in equities analysis. Later, he was responsible for the creation and distribution of life settlement products to hedge funds and investment banks. After, he co-founded a revenue cycle management company where he learned about Bitcoin and eventually Ethereal. Andrew's role at ConsenSys Enterprise is a mul...
DXWorldEXPO LLC announced today that "Miami Blockchain Event by FinTechEXPO" has announced that its Call for Papers is now open. The two-day event will present 20 top Blockchain experts. All speaking inquiries which covers the following information can be submitted by email to [email protected] Financial enterprises in New York City, London, Singapore, and other world financial capitals are embracing a new generation of smart, automated FinTech that eliminates many cumbersome, slow, and expe...
DXWorldEXPO | CloudEXPO are the world's most influential, independent events where Cloud Computing was coined and where technology buyers and vendors meet to experience and discuss the big picture of Digital Transformation and all of the strategies, tactics, and tools they need to realize their goals. Sponsors of DXWorldEXPO | CloudEXPO benefit from unmatched branding, profile building and lead generation opportunities.
The best way to leverage your Cloud Expo presence as a sponsor and exhibitor is to plan your news announcements around our events. The press covering Cloud Expo and @ThingsExpo will have access to these releases and will amplify your news announcements. More than two dozen Cloud companies either set deals at our shows or have announced their mergers and acquisitions at Cloud Expo. Product announcements during our show provide your company with the most reach through our targeted audiences.
DevOpsSummit New York 2018, colocated with CloudEXPO | DXWorldEXPO New York 2018 will be held November 11-13, 2018, in New York City. Digital Transformation (DX) is a major focus with the introduction of DXWorldEXPO within the program. Successful transformation requires a laser focus on being data-driven and on using all the tools available that enable transformation if they plan to survive over the long term. A total of 88% of Fortune 500 companies from a generation ago are now out of bus...
With 10 simultaneous tracks, keynotes, general sessions and targeted breakout classes, @CloudEXPO and DXWorldEXPO are two of the most important technology events of the year. Since its launch over eight years ago, @CloudEXPO and DXWorldEXPO have presented a rock star faculty as well as showcased hundreds of sponsors and exhibitors! In this blog post, we provide 7 tips on how, as part of our world-class faculty, you can deliver one of the most popular sessions at our events. But before reading...
Cloud Expo | DXWorld Expo have announced the conference tracks for Cloud Expo 2018. Cloud Expo will be held June 5-7, 2018, at the Javits Center in New York City, and November 6-8, 2018, at the Santa Clara Convention Center, Santa Clara, CA. Digital Transformation (DX) is a major focus with the introduction of DX Expo within the program. Successful transformation requires a laser focus on being data-driven and on using all the tools available that enable transformation if they plan to survive ov...
DXWordEXPO New York 2018, colocated with CloudEXPO New York 2018 will be held November 11-13, 2018, in New York City and will bring together Cloud Computing, FinTech and Blockchain, Digital Transformation, Big Data, Internet of Things, DevOps, AI, Machine Learning and WebRTC to one location.
DXWorldEXPO LLC announced today that ICOHOLDER named "Media Sponsor" of Miami Blockchain Event by FinTechEXPO. ICOHOLDER give you detailed information and help the community to invest in the trusty projects. Miami Blockchain Event by FinTechEXPO has opened its Call for Papers. The two-day event will present 20 top Blockchain experts. All speaking inquiries which covers the following information can be submitted by email to [email protected] Miami Blockchain Event by FinTechEXPO also offers s...
Dion Hinchcliffe is an internationally recognized digital expert, bestselling book author, frequent keynote speaker, analyst, futurist, and transformation expert based in Washington, DC. He is currently Chief Strategy Officer at the industry-leading digital strategy and online community solutions firm, 7Summits.
Digital Transformation and Disruption, Amazon Style - What You Can Learn. Chris Kocher is a co-founder of Grey Heron, a management and strategic marketing consulting firm. He has 25+ years in both strategic and hands-on operating experience helping executives and investors build revenues and shareholder value. He has consulted with over 130 companies on innovating with new business models, product strategies and monetization. Chris has held management positions at HP and Symantec in addition to ...
With tough new regulations coming to Europe on data privacy in May 2018, Calligo will explain why in reality the effect is global and transforms how you consider critical data. EU GDPR fundamentally rewrites the rules for cloud, Big Data and IoT. In his session at 21st Cloud Expo, Adam Ryan, Vice President and General Manager EMEA at Calligo, examined the regulations and provided insight on how it affects technology, challenges the established rules and will usher in new levels of diligence arou...